Magneto-optic current sensor having a mechanically stress-free .

Details Magneto-optic current sensor having a mechanically stress-free . Magneto-optic current sensor having a mechanically stress-free .

1997-12-05

1999-09-14

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

25022719, 3242441, G01B 902

Patent

active

059531215

ABSTRACT:
Without special measures, a fiber-optic current sensor coil (11) and fiber-optic .lambda./4 time delay elements (9, 9'), which are connected in series with the current sensor coil (11), are temperature-dependent with respect to a relative phase lag of light passing through. In order to avoid a temperature correction or temperature compensation, the current sensor coils (11) and, if appropriate, also the .lambda./4 time delay elements (9, 9') are annealed, so that virtually no mechanical stresses remain in the optical fibers. The current sensor coil (11) is preferably mounted unrestrained in a capillary (20) filled with a protective gas. The capillary (20) is embedded in a gastight fashion in a potting compound (22) made from polyurethane, and is thus also mechanically protected.

REFERENCES:
patent: 5492552 (1996-02-01), Cronk et al.
patent: 5500909 (1996-03-01), Meier
patent: 5644397 (1997-07-01), Blake
patent: 5696858 (1997-12-01), Blake
Optical Fibre Sensors, 10.sup.th International Conference, International Society for Optical Engineering, vol. 2360, Oct. 1994.
"Reciprocal reflection interferometer for a fiber-optic Faraday current sensor", Frosio, et al., Applied Optics, vol. 33, No. 25, Sept. 1994, p. 6111-6122.

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